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PC Hardware in a Nutshell, 3rd Edition by Barbara Fritchman Thompson, Robert Bruce Thompson

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Real-World Power Supplies Compared

Table 26-18 lists the output by voltage of three nominally 350-watt ATX12V power supplies. The PC Power & Cooling Turbo Cool 350 ATX/ATX12V is a premium unit, with a street price of about $65; the Antec SL350 is a name-brand unit that sells for about $45; the Sparkle Power Inc. (SPI) FSP350-60BN is another name-brand unit that sells for about $50. We would like also to have compared a no-name Pacific Rim power supply, but finding technical specifications for such units is impossible, probably because they vary so much from one lot to another that no one bothers to test them.

The three key voltage rails are +3.3V, +5V, and +12V. Note that, although all the power supplies list individual maximum outputs for +3.3V and +5V, they also note maximum combined output of +3.3V and +5V—215W for the PC Power & Cooling unit, 230W for the Antec, and 220W for the SPI unit. Antec is alone, however, in specifying maximum combined output on the +3.3V, +5V, and +12V rails.

Table 26-18. Output comparison of three nominal 350 watt power supplies

PC Power & Cooling

Turbo-Cool 350 ATX

Antec

SL350

Sparkle Power Inc.

FSP350-60BN

Rail

+/-

Amax

Watts

+/-

Amax

Watts

+/-

Amax

Watts

+3.3VDC

1%

28

92.4

5%

28

92.4

4%

28

92.4

+5VDC

5%

32

160

5%

35

175

5%

32

160

Maximum combined Wattage:

3.3 + 5

215

230

220

+12VDC

5%

15

180

5%

16

192

5%

15

180

Maximum combined Wattage:

3.3 + 5 + 12

n/a

330

n/a

-5VDC

5%

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